I'm not sure how much it will help "date" things. But Team Swarm ran with custom Piranha SB's that had the side air tube replaced with a pigtail of brass/copper line between the side tap and rear asa. Then they installed a rat attack in the asa. They also used the WGP 45 rd boxes with the scope flip caps. Again as has been said this was to meet the requirement of some tournies that were still 12g only.